#include<stdio.h>
void convert(int n){
	int i;
	if((i=n/10)!=0)
		convert(i);
	putchar(n%10+'0');
}
int main(){
	long number;
	printf("please input n:\n");
	scanf("%ld",&number);
	printf("ouput:\n");
	if(number<0){
		putchar('-');
		number=-number;
	}
	convert(number);
	putchar(10);
}
